Smoke-consuming furnace.



L. A. MILBANK. SMOKE GONSUMING FURNAGE. APPLICATION FILED JAN.22,1908.

Patented Ja11.5, 1909. 3 SHEETS-SHEET 1.

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L. A. MILBANK. SMOKE CONSUMING FURNAGB. APPLIoATIoN FILED J'AN.22,1sos.

Patented .12.11.5,1-909.

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Patented Jan. 5, 1909.

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LUTHER A. MILBANK, OF BOSTON, MASSACHUSETTS,- ASSIGNOR TO ROBERT L. WALKER FURNACE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

SMOICE -CON SUMING- FURNACE Specification of Letters Patent.

Patented Jan. 5, 1909.

Application filed January 22, 1908. Serial No. 412,208.

To all whom it may concern:

Be yit known that I, LUTHER A. MILBANK, a citizen of the United States, and resident of Boston, county of Suffolk, and State of Massachusetts, have made a certain new and useful Invention Relating to Smoke-Consuming Furnaces, 'of which the following is a specification, taken in connection with the accompanying drawings, forming part of the same.

This invention relates to smoke-consuming furnaces and relates especially to locomotive boiler furnaces for consuming or suppressing sparks and smoke of the general type disclosed in the Wralker patent 821,628, of May 22, 1906.

In the drawings showing an illustrative embodiment of this invention, and in which the same reference numeral refers to similar parts in the several figures, Figure 1 is a longitudinal vertical sectional view. Fig. 2 is a transverse section along line 2-2 of Fig. 1. Fig. 3 is a similar transverse section along the line 3-3 of Fig. 1. Fig. 4 is a rear elevation. Fig. 5 is a transverse sectional view of the tre-boX; and Fig. 6 is an enlarged vertical section through the damper and connected parts.

In the illustrative embodiment of the invention shown in the drawings the locomotive boiler may be of regular construction and provided with the iire tubes 2 leading from the {ire-box to the smoke-box 3 which communicates with the stack 125. The tirebox which may be provided with the grate bar 6 of usual construction and operation may be divided at its lower rear portion by a water leg 5 so as to form a throat 1 around the front of this water leg beneath the corrugated combustion arch 4 of rebrick or other suitable material. The circulation of water is maintained through the water leg by providing suitable inlets and outlets, such as the inlet 107 and the outlet 108 leading into the thrust bearing or saddle 22 mounted upon the water leg, the outlet 108 connecting with the pipe 23 leading into the boiler. The additional outlets such as 124 may also be provided and serve to brace the water leg against lateral displacement, see Fifr. 5.

The pivoted damper 7 may be mounted above the water leg in any desired way so as to properly close the opening behind the combustion arch on either side of the reboX when swung down into horizontal position on that side, as is indicated clearly in Fig. 5. This damper 7 which is seen in its vertical or mid position in Fig. 1 may be provided with a suitable zigzag damper passage 8 gradually expanding as it passes around the various ribs 9. The pivot or forward portion of the damper which engages the thrust bearing 22 may be formed with an inlet conduit 157, the forward end 154 of this conduit being iirmly supported by the radial webs 152 so as to secure proper cooperation with the seat 153. In this way water may be forced by any desired means through the pipe 24 into the inlet chamber 150 and thence through the inlet conduit into the expanding damper passage 8. An axial return pipe or passage 155 may be provided to receive the water from the zigzag passage through the body of the damper and convey the same through the annular passage around the inlet conduit into the discharge chamber 156 from which it passes through the discharge pipe 23 to the upper part of the boiler. If desired a reduced portion 158 may be formed on the damper pivot as well as an inclined shoulder 159 to cooperate with the socket 160 in the thrust bearing so as to secure a tighter and more reliable joint at this point. rlhe rearward extension or trunnion 10 of the damper may `friction cones 15 engage and coperate in connection with a corresponding recess in the plate 14 which may be adjustably held by the bolts 32 so as to properly adjust the thrust or end pressure on the damper.

The operating rack 47 engages the pinion as indicated in Fig. 4 and is connected with the cross arms 37, 38 which also carry the piston rods 36, 39. The piston 35 on the piston rod 36 operates in the steam cylinder 34 receiving steam through the pipes 41, 42. The three way valve 43 receives steam through the valved inlet 44 and controls its admission to either end of the steam cylinder so as to actuate the operating 4rack and swing the damper to one side or the other. The rod 39 carries a suitable piston or plunger in the dashpot or retarding cylin-Vv der 40. This cylinder may be filled with water or other desired fluid and exert a regulated cushioning action by suitable adjustment of the throttle valve 46 in the pipe 45 connecting the two ends of the cylinder. The larm 13 on the end of the trunnion also exerts a desirable cushioning action and retards the movement of the damper as it approaches a horizontal position. F or this purpose the arm is connected with the chain 111 between the stoke holes 122, the chain having the buffer 113 and buffer stem 112 at its lower end, the buffer being acted upon by a strong spring 114. Y

In order to insure a positive' and reliable circulation of water through the damper and effectively prevent any heat injury during its operation, a plurality of circulating pumps, such as 27 and 127, may be employed. These pumps may be mounted on suitable supports 103 secured to the stay plate 102 by rivets 104. The circulating pump 27 is operated by steam from the valved inlet 28 and the circulating pump 127 is similarly operated when the valved inlet 12S is open. Both these pumps receive water from the boiler connection 30 and discharge the water past the check valves 29, 129 into the pipe 26, so that it forcibly issues from the injector nozzle 31. In this way, water is drawn in through the holes in the injector 25 and forced through the inlet pipe 24 supplying the damper passage. The duplication of the circulating pumps renders it extremely easy to throw in a reserve pump at a moments notice in case of the failure of the pump regularly operated. By using an axial return passage and discharging the water through the forward pivot of the damper the rear trunnion can be made very short so as to occunv little, if any, available room in the firing space of the cab. In this way the firing operations are not interfered with which is a most important consideration in locomotive practice.

Having described this invention in connection with an illustrative embodiment thereof, to the details of which disclosure the invention is not, of course, to be limited, what is claimed as new and what is desired to be secured by Letters Patent is set forth in the appended claims:

1. In a locomotive furnace, a fire-box provided with a grate, a combustion arch above said grate at the front portion of said firebox, a water leg extending adjacent the front of Said fire-box and dividing the same into compartments, there being a throat in front of said water leg and beneath said combustion arch to connect said compartments, a

enga-7a swinging damper mounted above said water leg to close the top of one of said compart-4 ments while leaving open said connecting throat, said damper having a pivot engaging a thrust bearing secured to said water leg and having an enlarging zigzag passage and an axial return passage discharging into said thrust bearing, said damper having a trunnion projecting through the rear water nface of said boiler, means to operate saidl damper, a duplicate circulating pump, an

injector provided with connections with said pump to force the water of said boiler into and through said damper passage there being check-valves in said connections adjacent said pump.

2. In a locomotive furnace, a fire-box provided with a grate, a water leg dividing said fire-box into compartments, a thrust bearing mounted on said water leg and provided with an inlet chamber and a discharge chamber connected with said water leg and with a discharge pipe, a swinging damper having a pivot coperating with said thrust bearing and having an internal axial inlet conduit communicating with said inlet chamber and communicating with a refiexed damper passage and having an axial return passage communicating with said damper passage and with said discharge chamber, there beingV a trunnion on said damper projecting through the rear water face of the boiler and cooperating with means to turn said damper to normally hold the same inY engagement with said thrust bearing.

3. In a locomotive furnace, a fire-box provided with a grate, a thrust bearing having an inlet chamber and discharge chamber, a swinging damper to operate in said fire-box and having a pivot coperating with said thrust bearing and provided with an internal axial inlet conduit communicating with said inlet chamber and with a concentrically arranged axial return passage communicating with said discharge chamber and a crooked passage through the body of said damper between said inlet conduit and said pivot.

4. In a locomotive furnace, a fire-box provided with a grate, a thrust bearing having an axial chamber and al separate outer chamber, a swinging damper having a pivot co'perating with said thrust bearing and provided with a conduit to cooperate with said axial chamber in said thrust bearing and with a passage located around said conduit and communicating with said outer chamber in said thrust bearing and with a crooked passage extending through the body of said damper between said conduit and said passage.

5. In a locomotive furnace, a fire-box' provided with a grate, a water leg in said fire*- box, a thrust bearing mounted on said water @callas leg and provided with an axial inlet chamber and with an outer discharge chamber, a plurality of circulating pumps taking water from the boiler of said locomotive, an injector having connections with said pumps and supplying Water to said inlet chamber, check-valves in said connections, a damper in said fire-box and havin a pivot coperating with said thrust bearing and provided with an inner inlet conduit coperating with said inlet chamber and with an axially arranged return passage communicating with said discharge chamber and with a crooked enlarging damper passage through the body of said damper between said inlet conduit and said return passage.

6. In a locomotive furnace, a re-box provided with a grate, a thrust bearing having an axial chamber and separate outer chamber, a swinging damper having a pivot cooperating with said thrust bearing and provided with a conduit to coperate with said axial chamber in said thrust bearing and with a passage located outside said conduit and communicating with said outer chamber in said thrust bearing and with an elongated passage extending through the body of said damper between said conduit and said pas= sa e.

g. In a locomotive furnace, a fire-box, a' thrust bearing having an axial chamber and a separate outer chamber, a swinging darnper having a pivot cooperating with said thrust bearing and provided with a conduit to coperate with said axial chamber in said thrust bearing and with a communicating passage extending outside said conduit and communicating with said outer chamber in said thrust bearing.

LUTHER A. MILBANK.

Witnesses:

MALCOLM GREEN, CHAs. C. BUCKMAN.

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